From: Yuchung Cheng <ycheng@google.com>
To: davem@davemloft.net
Cc: netdev@vger.kernel.org, edumazet@google.com,
ncardwell@google.com, soheil@google.com,
Yuchung Cheng <ycheng@google.com>
Subject: [PATCH 0/2 net-next] tcp: do not use RTT from delayed ACKs for min-RTT
Date: Wed, 17 Jan 2018 12:10:59 -0800 [thread overview]
Message-ID: <20180117201101.14137-1-ycheng@google.com> (raw)
This patch set prevents TCP sender from using RTT samples from
(suspected) delayed ACKs as the minimum RTT, to avoid unbounded
over-estimation of the network path delay. This issue is common
when a connection has extended periods of one packet chit-chat
beyond the min RTT filter window. The first patch does that for TCP
general min RTT estimation. The second patch addresses specifically
the BBR congestion control's min RTT filter.
Yuchung Cheng (2):
tcp: avoid min-RTT overestimation from delayed ACKs
tcp: avoid min RTT bloat by skipping RTT from delayed-ACK in BBR
include/net/tcp.h | 1 +
net/ipv4/tcp_bbr.c | 3 ++-
net/ipv4/tcp_input.c | 24 ++++++++++++++++++++++--
3 files changed, 25 insertions(+), 3 deletions(-)
--
2.16.0.rc1.238.g530d649a79-goog
next reply other threads:[~2018-01-17 20:11 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-01-17 20:10 Yuchung Cheng [this message]
2018-01-17 20:11 ` [PATCH 1/2 net-next] tcp: avoid min-RTT overestimation from delayed ACKs Yuchung Cheng
2018-01-17 20:11 ` [PATCH 2/2 net-next] tcp: avoid min RTT bloat by skipping RTT from delayed-ACK in BBR Yuchung Cheng
2018-01-19 20:39 ` [PATCH 0/2 net-next] tcp: do not use RTT from delayed ACKs for min-RTT David Miller
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